论文标题
在递归logit模型的估计期间捕获积极的网络属性:一种基于PRISM的方法
Capturing positive network attributes during the estimation of recursive logit models: A prism-based approach
论文作者
论文摘要
尽管递归logit(RL)模型最近很受欢迎,并且导致了许多应用和扩展,但关于价值函数计算的重要数值问题仍未解决。对于模型估计,此问题尤其重要,在此期间,参数被更新了所有迭代,并可能违反了价值函数的可行性条件。为了解决模型估计中值函数的数值问题,本研究对Oyama和Hato(2019)提出的PRISM受限的RL(PRISM-RL)模型进行了广泛的分析,该模型的路径集受到根据状态扩展的网络表示所定义的PRISM的约束。数值实验显示了参数估计的Prism-RL模型的两个重要特性。首先,基于棱镜的方法可以估算不管初始参数值和真实参数值如何,即使在原始RL模型由于数值问题而无法估算的情况下。我们还成功地捕获了街道绿色对行人路线选择的积极作用。其次,Prism-RL模型通过隐式限制大型绕道或许多循环的路径,实现了比RL模型更好的拟合度和预测性能。通过以数据为导向的方式定义基于棱柱的路径,我们证明了Prism-RL模型描述更现实的路线选择行为的可能性。在许多应用程序(例如行人路线选择和顺序的目的地选择行为)中,捕获正网络属性的捕获同时保留路径替代方案的多样性很重要,因此基于Prism的方法显着扩展了RL模型的实际适用性。
Although the recursive logit (RL) model has been recently popular and has led to many applications and extensions, an important numerical issue with respect to the computation of value functions remains unsolved. This issue is particularly significant for model estimation, during which the parameters are updated every iteration and may violate the feasibility condition of the value function. To solve this numerical issue of the value function in the model estimation, this study performs an extensive analysis of a prism-constrained RL (Prism-RL) model proposed by Oyama and Hato (2019), which has a path set constrained by the prism defined based upon a state-extended network representation. The numerical experiments have shown two important properties of the Prism-RL model for parameter estimation. First, the prism-based approach enables estimation regardless of the initial and true parameter values, even in cases where the original RL model cannot be estimated due to the numerical problem. We also successfully captured a positive effect of the presence of street green on pedestrian route choice in a real application. Second, the Prism-RL model achieved better fit and prediction performance than the RL model, by implicitly restricting paths with large detour or many loops. Defining the prism-based path set in a data-oriented manner, we demonstrated the possibility of the Prism-RL model describing more realistic route choice behavior. The capture of positive network attributes while retaining the diversity of path alternatives is important in many applications such as pedestrian route choice and sequential destination choice behavior, and thus the prism-based approach significantly extends the practical applicability of the RL model.